Go Back   Home > Forums > Commercial Sector > Vendor Forums > Audio Sector

Audio Sector Kits & PC boards from AudioSector

Reply
 
Thread Tools Search this Thread
Old 28th January 2014, 08:43 AM   #1731
diyAudio Member
 
tiglitosa's Avatar
 
Join Date: Feb 2009
Location: Athens Greece
Send a message via MSN to tiglitosa
Prevent thermal coupling with the floor? No i think the floor is coupled (or should be ) with the copper bar and the cable should pass either from the side which has a gap, or from a hole that should be opened in the copper.
As far as the top goes i agree with you.

Nick
  Reply With Quote
Old 28th January 2014, 02:14 PM   #1732
diyAudio Member
 
Join Date: Dec 2013
The copper bar is bolted to the aluminum chassis, I don't think the heat-sink will reach temperatures that will melt the insulation of the cables.

What worries me tho is that the amp will get quiet warm even when not playing. Because the fuse in my multimeter is blown I can not measure the current.

Is there a "rest current" in the LM4780 like a class A amp.?

Regards,

Joery
  Reply With Quote
Old 28th January 2014, 03:28 PM   #1733
diyAudio Member
 
Join Date: Dec 2013
Btw, the DC voltage at output is 45 mV with volume at max and 4 mV with volume off
  Reply With Quote
Old 28th January 2014, 05:29 PM   #1734
diyAudio Member
 
Join Date: Dec 2013
If it was maybe not clear but the design is that the bottom of the amp will float. The thickness of the toroid is bigger then the hight of the chassis so I will make stands on the chassis (one hole already made) to make the amp float and the chassis and copper bar will never touch the floor.
Attached Images
File Type: jpg WP_20140123_012.jpg (418.7 KB, 105 views)
  Reply With Quote
Old 29th January 2014, 08:34 AM   #1735
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by Joerytech View Post
Btw, the DC voltage at output is 45 mV with volume at max and 4 mV with volume off
That tells me there is something wrong with the DC blocking input capacitor.
It could be leaking badly or fitted in the wrong location, or omitted.

Are your voltages DC?
i.e. 45mVdc and 4mVdc?
__________________
regards Andrew T.
  Reply With Quote
Old 29th January 2014, 08:37 AM   #1736
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
If you can connect the copper bar to more of the thick aluminium case, the chip/s will run cooler.

What about the previous suggestion to run the 5 enameled wires THROUGH the copper bar and then Thermally connect the bar to the bolted down lid?
__________________
regards Andrew T.
  Reply With Quote
Old 29th January 2014, 07:47 PM   #1737
diyAudio Member
 
Join Date: Dec 2013
Quote:
Originally Posted by AndrewT View Post
That tells me there is something wrong with the DC blocking input capacitor.
It could be leaking badly or fitted in the wrong location, or omitted.

Are your voltages DC?
i.e. 45mVdc and 4mVdc?
The voltages are DC and what read in the previous comments the values are within limits.
I don't use input caps as they can make the sound quality worse.
I will leave the bottom of the amp open so if I need more heat dissipation i have to put a heat-sink on top of the amp.
This time I'm listening to the amp and must say it REALLY sounds great.
Peter together with the inventors of the LM4780 are great.

Thanks for that.

Greetz,

joery
  Reply With Quote
Old 2nd February 2014, 04:49 PM   #1738
diyAudio Member
 
Join Date: Dec 2013
Weird enough I found out that the temp of the amp with no load is getting less after playing it for longer time?!

The neighbors are on holiday now so I pushed the amp to max for quiet some time and it performs well, its getting quiet warm but without any problems.

The combination of this amp with my speakers (Mission M52) is perfect.

On the pics you can see the stands its resting on, the power connection is not good yet, in the future I will make it nice.

Now I'm using a 6A slow fuse.

The coming days I will make the side panels from oak wood and I will replace the volume knob with a nice aluminum one.

All the bolts are from stainless steel.

Greetz,

Joery
Attached Images
File Type: jpg WP_20140202_001.jpg (582.7 KB, 88 views)
File Type: jpg WP_20140202_002.jpg (594.5 KB, 79 views)
File Type: jpg WP_20140202_003.jpg (427.1 KB, 74 views)
File Type: jpg WP_20140202_004.jpg (503.7 KB, 75 views)
File Type: jpg WP_20140202_005.jpg (509.7 KB, 53 views)
File Type: jpg WP_20140202_006.jpg (361.2 KB, 46 views)
  Reply With Quote
Old 2nd February 2014, 05:18 PM   #1739
diyAudio Member
 
Join Date: Dec 2013
Now I'm using the output from my laptop and its actually not bad, In the future I will get a DAC to improve the sound quality.

I'm thinking about the dragonfly 1,2, it seems to preform good. Any comments about that?

Greetz,

Joery
  Reply With Quote
Old 2nd February 2014, 05:28 PM   #1740
diyAudio Member
 
lanchile's Avatar
 
Join Date: Sep 2008
Location: AREA 51
Quote:
Originally Posted by Joerytech View Post
Now I'm using the output from my laptop and its actually not bad, In the future I will get a DAC to improve the sound quality.

I'm thinking about the dragonfly 1,2, it seems to preform good. Any comments about that?

Greetz,

Joery
I do not see the power supply caps!
Am I blind?
__________________
Make it simple...Make it better!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Commercial complete Gainclone kit for a beginner? gychang Chip Amps 365 4th October 2011 08:19 AM


New To Site? Need Help?

All times are GMT. The time now is 12:27 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2